Somewhat standalone spinoff of Excel Saga. It has the same director and overall style of humor. Compare to Excel Saga insanity went all the way to the new heights. At timed it made even me somewhat uncomfortable, may be because protagonist girl is clearly underage. However it is a very fun show, that fans of the original can enjoy. Fans of Gintama and Nichijou as well. As far as I remember you do not need to watch Excel Saga to understand what is going on. However it is probably best if you do watch it first. This show parodies magical girl genre as well as tentacles sexin hentai. It also touches on BDSM and sexuality generally. Stuff that became more explicit as anime developed.

In some ways this show was a pioneer of the future trends. Much like Space Capitan Herlock.

Overall I can recommend it to all fans of comedy as well as to people interested in history of anime.